Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 49, Pages 14830-14834Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201508475
Keywords
gels; molecular recognition; porphyrins; rheology; supramolecular polymers
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Funding
- JSPS [24350060, 15H03817]
- MEXT [15H00946, 15H00752]
- Grants-in-Aid for Scientific Research [15H00946, 15H00752, 13J02077, 15H03817, 15KT0145] Funding Source: KAKEN
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Bisporphyrin cleft molecule 1Zn possessing a guest moiety assembled to form supramolecular polymers through host-guest interactions. Bispyridine cross-linkers created interchain connections among the supramolecular polymers to form networked polymers in solution. Solution viscometry confirmed that the cross-linked supramolecular polymers were highly entangled. Frequency-dependent linear viscoelastic spectroscopy revealed that the supramolecular polymers generated well-entangled solutions with associating and networking polymers, whereas the solid-like aggregates moved individually without breaking and reforming structures below the transition temperature of 9.6 degrees C. Morphological transition of the supramolecular polymers was evidenced by AFM images; the non-cross-linked polymer resulted in wide-spread thin networks, while the cross-linked networks produced thicker worm-like nanostructures. The supramolecular networks gelled in 1,1,2,2-tetrachloroethane, and an elastic freestanding film was fabricated with a Young's modulus of1 GPa.
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